Degree of Substitution of Dextran Modified through Reaction with Organostannane Chlorides and Group IV-B Metallocene Dichlorides

作者: Charles E. Carraher , Yoshinobu Naoshima

DOI: 10.1007/978-1-4615-3844-8_13

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摘要: Dextrans represent a potential market of 2 × 105 tons per year. Reaction with Groups IV-A and B organoraetallics show distinct trends respect to loading or presence organometallic moiety repeat sugar unit. For Group IV-B metallocene dichlorides, can be easily varied from less than one unit full loading, presumably due the lack tendency form cyclic products. By comparison, organostannane halides is typically order 0.25 0.5 tin dilhalides internal formation probably occurs major extent limiting loading. Use selected PTAs allows organostannanes increased two tins

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